Synthesis, X-ray structure, thermal and magnetic behavior of [(bipy) 2Ni2(μ-Cl)2Cl2(H 2O)2]: The first neutral ferromagnetically coupled six-coordinate dichlorido-bridged nickel(II) dimer

Oluwatayo F. Ikotun, Wayne Ouellette, Francesc Lloret, Miguel Julve, Robert P. Doyle

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

NiCl2·6H2O and 2,2′-bipyridine (bipy) (1:1) were allowed to react under ambient conditions in dimethyl sulfoxide in the presence of acetylacetone (Hacac). The resulting green solution was concentrated in vacuo, and a green solid was isolated by precipitation with cold acetone. X-ray guality crystals of [(bipy)2Ni2(μ-Cl) 2(Cl)2(H2O)2] (1) were grown by subsequent vapor/liquid diffusion of acetonitrile into a methanolic solution for one week. The structure of 1 consists of a dimeric nickel system with each metal atom in an octahedral geometry. Both equatorial bridging and axial chlorine atoms are present in this neutral species. The nickel-nickel distance (3.441 Å) is the shortest reported to date for this class of complexes and the bridging chlorido angles at 91.5° are the most acute. Variable-temperature magnetic susceptibility measurements reveal the complex to have the strongest ferromagnetic interaction reported to date (J = +16.8 cm -1, the Hamiltonian being defined as H = -JSA· SB) for this family of complexes.

Original languageEnglish (US)
Pages (from-to)2083-2088
Number of pages6
JournalEuropean Journal of Inorganic Chemistry
Issue number14
DOIs
StatePublished - Jul 2 2007

Keywords

  • Crystal structures
  • Ferromagnetic coupling
  • Nickel complexes
  • Thermal analysis

ASJC Scopus subject areas

  • Inorganic Chemistry

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